.card-wrap {
  position: relative;
  margin: 10% auto 0 auto;
}

.tips {
  position: absolute;
  top: -20%;
  left: 20%;
  font-size: 20px;
}

.card-item {
  font-size: 28px;
  position: absolute;
  text-align: center;
  border-radius: 2px;
  box-sizing: border-box;
  background: #ddd;
  opacity: 1;
  cursor: pointer;
  transition: all 0.3;
  box-shadow: 0px 3px 0 0 #fff, 0 8px 0 0 #ddd, 0 8px 0 2px #333, 0 0 0 2px #333;
}

/* 悬浮变大一丢丢 */
.card-item:hover {
  transform: scale3d(1.1, 1.1, 1.1);
  z-index: 1;
}

.item-cover {
  pointer-events: none;
  box-shadow: 0px 3px 0 0 #999, 0 8px 0 0 #666, 0 8px 0 2px #000, 0 0 0 2px #000;
}

/* 利用伪元素使不可见 */
.item-cover:after {
  border-radius: 2px;
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  left: 0;
  top: 0;
  background: #000;
  opacity: 0.55;
}

.tools {
  position: absolute;
  display: flex;
  justify-content: space-around;
  top: 160%;
  width: 100%;
  left: 0;
  text-align: center;
  cursor: pointer;
}

.select-list {
  position: absolute;
  top: 120%;
  border: 2px solid #000;
}

.save-list {
  position: absolute;
  top: 90%;
  border: 2px solid #000;
}

.tools-item {
  width: 45px;
  height: 45px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgb(34, 155, 196);
  box-shadow: 0px 3px 0 0 #fff, 0 8px 0 0 #ddd, 0 8px 0 2px #333, 0 0 0 2px #333;
}

/* 悬浮变大一丢丢 */
.tools-item:hover {
  transform: scale3d(1.1, 1.1, 1.1);
  z-index: 1;
}
